New York Giants linebacker Jonathan Casillas, the team’s defensive captain last year, was with Steve Spagnuolo in 2012 when Spagnuolo was coordinator of a historically awful New Orleans Saints’ defense. He was with Spags in 2015, when Spags was the coordinator and the Giants’ defense was atrocious.
Spagnuolo is still the coordinator, and the Giants’ defense is no longer awful. In fact, it is one of the best in the league. Largely, that’s because the Giants have far superior players than the ones Spagnuolo was handed in first year back with the Giants.